<template>
  <div>
    <label  v-for="item in arr" :key="item">
        <input type="checkbox" v-model="checkNumArr" :value='item'>{{item}}
    </label>
    <p>你选中的元素, 累加的值和为: {{ theSum }}</p>
  </div>
</template>

<script>
export default {
  data(){
    return {
        arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
        checkNumArr:[]
    }
  },
 computed: {
    theSum() {
      return this.checkNumArr.reduce((sum, val) => {
        return (sum += val);
      }, 0);
    },
  },
  
}
</script>

<style scoped>

</style>